tests/contracts_expects.nit

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   3 # Licensed under the Apache License, Version 2.0 (the "License");
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   7 #     http://www.apache.org/licenses/LICENSE-2.0
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  10 # distributed under the License is distributed on an "AS IS" BASIS,
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  12 # See the License for the specific language governing permissions and
  13 # limitations under the License.
  14
  15 # Verification if it's possible to define a simple expects contract.
  16
  17 class MyClass
  18         fun foo(x: Int)
  19         is
  20                 expect(x > 0)
  21         do
  22                 if x <= 0 then print "FAIL"
  23         end
  24 end
  25
  26 class MyClass2
  27         fun foo(bool: Bool)
  28         is
  29                 expect(not bool)
  30         do
  31                 if bool then print "FAIL"
  32         end
  33 end
  34
  35 var first = new MyClass
  36 first.foo(1) # OK
  37 var second = new MyClass2
  38 second.foo(false) # OK